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Subject: Re: ZFS performance help sought
References: <20160121205139.GG4538@blisses.org>
 <ea3f05f9a8c20bd62a1c391b432dafe2@dweimer.net>
 <20160121232810.GJ4538@blisses.org> <20160121235545.GK4538@blisses.org>
 <CADyrUxNEYh8bUSvQHKp+95yfh8NU2UWRYVU0xzdqWJyxV_vbNw@mail.gmail.com>
 <20160122001202.GM4538@blisses.org>
Cc: freebsd-questions@freebsd.org
From: "William A. Mahaffey III" <wam@hiwaay.net>
Message-ID: <56A1A4AD.2030600@hiwaay.net>
Date: Thu, 21 Jan 2016 21:45:59 -0553.75
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On 01/21/16 18:18, Mason Loring Bliss wrote:
> The disks in question:
>
> ada0: <ST500DM002-1BD142 KC43> ATA8-ACS SATA 3.x device
> ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
> ada1: <WDC WD5000AAKX-22ERMA0 17.01H17> ATA8-ACS SATA 3.x device
> ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
> ada2: <Hitachi HDS721010KLA330 GKAOA9DA> ATA-7 SATA 2.x device
> ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
> ada3: <WDC WD10EZEX-00BN5A0 01.01A01> ACS-2 ATA SATA 3.x device
> ada3: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)


Hmmmm .... 3 different brands, 4 different models, & 1 looks like a 
SATA2, while the rest are SATA3 .... I have always heard that is a 
recipe for problems/slow IO/bad performance/etc.


-- 

	William A. Mahaffey III

  ----------------------------------------------------------------------

	"The M1 Garand is without doubt the finest implement of war
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